Keyhole-guard.



F. BERGER-H AHNEL.

KEYHOLE GUARD.

APPLICATION FILED JULY 16, 1913- Patented July 28, 1914.

.. I... w w u an m M m M M m 0 a Y K N a L a 7 M M witfle Z4; km a FRANZ IBERGER-HAHNEL, OF ULLGERSDORF, NEAR BODENBAGH, AUSTRIA-HUNGARY.

KEYHOLE-GUARD.

Specification of Letters Patent.

Application filed July 16, 1918.

Patented July .28, 1914;.

Serial No. 779,388.

To all whom it may concern Be it known that I, FRANZ Bnnonn- Hal-mun, a subject of the Emperor of nus triadlungary, and resident of Ullgersdori', near Bodenbach, Bohmen, Austria-Hum gary, have invented certain new and. useful Improvements in Keyhole-Guards, oil which the following is a specification.

This invention relates to an improved keyhole guard, which essentially comprises a shell designed to be inserted in the keyhole of a lock and fitted with pivotal wings, which by means of a key can be made to trai'isversely project from the shell after insertion of the latter, so that the same cannot be removed but with the aid of said key.

The accompanying d 'awing shows the improved guard.

Figures 1 and 2 are respectively a longitudinal central section and a cross section through the same, with the wings in their inoperative position, while Figs. 3 and i are similar sections to the former, with the wings in their operative position. Fig. shows, in a perspective view, how the guard is inserted in a keyhole, with the key belonging thereto.

The improved guard comprise' an openended shell a, which is designed to be insorted in the keyhole oi a. lock. In said shell, two fixed bridges I) are located for the reception of a revoluble spindle 0. Between the two bridges the spindle is provided with screw-threads with a nut (Z thereon. The latter carries pivotal wings c, which, when the nut assumes one of its end positions, project with. their ends somewhat through slots in the walls of the shell in such a way that said ends are prevented from entering the interior of the shell. The ends of the spindle c projecting beyond the bridges are provided with square portions for the reception of a key h (Fig. 5) inserted through either end of the shell. The shell carries a outer rib g for preventa'ltter its insertion 1n the keyhole. lly means of a key it, the spindle r is then turned, whereby the nut is removed thereon in such a my that the wings, which with their front ends strike against the ends of the slots f, project transversely from the shell. After removal 01 the key, the shell cannot be removed from the keyhole but by again inserting the key /L therein, the disengagement oi the wings being then ell'ected in the same way but vice versa.

(What I claim is:

A keyhole guard comprising in combination, an open-ended shell having slots in its walls and a laterally projecting outer rib, bridges in said shell, a screw-spindle revolubly mounted in said bridges, a nut on that part of the spindle lying between said bridges, key-operated square portions on the ends o'l said spindle projecting beyond said bridges, and pivotal wings so arranged on said nut that they are disposed within the shell but prevented from entirely entering the latter upon the nut being screwed into one of its end positions while they project trimsversely therefrom upon the nut being screwml in other directions, substantially as described and Shown.

in testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

FRANZ BERG Ell-HAHN Eli.

Witnesses PAUL ARRAS, Finax VOGL.

Copies of this patent may be obtained for five cents each, by addressing the "Commissioner of Patents, Washington, D. C. 

